Brakeshoe construction for disk brakes



Nov. 11,1969 amma ETAL 3,477,551

BRAKESHOE CONSTRUCTION. FOR DISK BRAKES Filed Jan; 19, 1968 6 Sheets-Sheet 1 1 anmmm -llOb llb l II b 0 Friedrich BEUCHLE Heinz HARM Hans Christof KLEIN Hans HELLER INVENTORS BY R 91 1?! Attomev F. BEUCHLE ETAL BRAKESHOE CONSTRUCTION FOR DISK BRAKES Nov. 11, 1969 6 Sheets-Sheet 2 Filed Jan. 19, 1968 B 4 G H F I G .5 A

Friedfich BEUCHLE Heinz HAHM Hans Christof KLEIN Hans BELLER INV'ENTORS Attorney Nov. 11, 1969 F. BEucHu-i ETAL ,477,55

BRAKESHOE CONSTRUCTION FOR DISK BRAKES 7 Filed Jan. 19, 1968 6 Sheets-Sheet 3 FIG.6B

Heinz HAHW Hans Christof KLEIN Hans BELLER INVENTOR. s

Attorney Friedrich BEUCHLE,

Nov. 11, 1969 F. BEUCHLE ETAL 3,477,551

BRAKESHOE CONSTRUCTION FOR DISK BRAKES Filed Jan. 19. 1968 6 Sheets-Sheet 4.

FIG.7A

-FlG.7 D

-34?! n gy w Friedifih BEUCHLE Heinz HAHM Hans Christ'of KLEIN Hans BELLER INVENTORS marl g: f Rou Attorney Nov. 11', 1969 F, ssucHL ETAL ,477,5 1

BRAKESHOE CONSTRUCTION FOR DISK BRAKES Fild Jan. 19, 1968 I s Sheets-Sheet 5 FIG.

FIG.8D

N 12,, no"

7s" -rs" A J 71" me i- INVENTOR.s

Friedrich BEUCHLE Heinz HAHN- Hans Christof KLEIN Hans BELLER Attorney gear! g Tm.

1969 F. BEUCHLE ETAL 3,477,55

BRAKESHOE CONSTRUCTION FOR DISK BRAKES 6 Sheets-Sheet 6 Filed Jan; 19. 1968 FIG.9A

FIG

FIG.9D

Hinz HAHB Hans Chris tof KLEIN Hans BELLER INVENTORS ge 9, R0,,

Attorney United States Patent Int. Cl. F16d 69/02 U.S. Cl. 188-250 V Claims ABSTRACT OF THE DISCLOSURE A brakeshoe construction for a disk brake in which a brake liningof ceramic or ceramic-like material is surrounded in whole or in part by a band which may form a frame for an open-work web into the interstices of which the brake lining extends or a sheet-metalweb with or without perforations'When-the frame has no web, it preferably completely surrounds a large step milled into the lining material or is spring-biased by inherent resilience against the periphery of the lining. When provided with a web, the band may be a flange extending along the periphery of the web to retain the lining in a pocket formed within the flange or a frame foran opening, later being embedded in the lining body. In all cases, guide apertures for the guide rods of a disk brake are formed integrally by lugs of the frame or web or are located within the frame.

Our present invention relates to a brakeshoe construction for disk-type brakes and, more particularly, to a brakeshoe which comprises a brake lining of highfrictional coefiicient, low wear and good resistance to moisture and oil, mounted upon a backing plate or lining carrier.

Disk-type brakes have gained increasing prominence in recent years as a result of their improved response, the low volume of fluid which must be displacedby the master cylinder to actuate them, and the rapidity with which they are able to bring a vehicle to standstill. In general, a disk brake for automotive-vehicle application, comprises a brake disk which is rotatably entrained with a wheel of the vehicle, e.g. by being mounted upon the tire-carrying wheel disk or upon the axle shaft of a wheel, and a brake housing in the form of a U-shaped yoke extending around the periphery of the disk and connected with a relatively stationary part of the vehicle structure. This part may be anaxle housing, some other portion of the suspended chassis or the vehicle body or chassis itself. The yoke, which may be axially shiftable in a direction perpendicular tothe opposite annular braking faces of the disk or may be'fixed with respect to movement in this direction, is provided with a pair of brakeshoes confronting the respective braking faces and thus flanking the disk While being movable perpendicularly to these braking faces and parallel to the axis of rotation of the disk. Such movement may be independent of movement of the brake yoke or may be a consequence of the axial movement thereof. To actuate the brakeshoes, one or more wheel-brake cylinders can be provided in the brake yoke with corresponding pistons individual to the brakeshoes and adapted to bear directly against the latter to apply the brakeshoes to the disk. The brakeshoes are dimensioned to occupy only a minor segment of the total annular extent of the respective braking face and thus may be considered as segmental or spot-type brakeshoes by contrast with other disk-brake systems in which annular brakeshoes may be employed. The hydraulic fluid necessary to supply the wheel-brake cylinders is delivered by a master cylinder actuated by the brake pedal. In some cases, only a single wheel-brake cylinder 'ice is provided, this cylinder receiving a piston which bears against one of the brakeshoes to urge the latter directly against the disk and thus bears upon this brakeshoe.

Since the brake lining is selected in accordance with its frictional characteristic, its corrosion resistance and its insensitvity to moisture and other contaminants, its rigidity or mechanical strength may be insufficient alone to withstand the compressive force applied over limited areas by the brake-actuating means, namely the wheelbrake piston or force-transmitting member. Accordingly, prior-art brakeshoes have generally comprised a massive cast-iron or steel backing plate to which an organic-based or inorganic lining was bonded, the piston or the forcetransmitting member bearing against the backing plate. The bonding was effected by rivets or the like. In still other arrangements, dovetail formations were provided on-the lining and backing plate to withstand the stresses developed between lining and backing plate during the brake-application step. It will be appreciated that, when the backing plate is guided in the brake yoke or housing and prevented from lateral movement by this housing, and the lining frictionally engages the disk, a. significant shear force develops at the interface between the lining and the;backing plate. As a practical matter, earlier methods of securing the lining to the backing plate have been unsatisfactory, to a large measure, because of inability to withstand these shear stresses.

It is, therefore, the principal object of the present invention to provide an improved brakeshoe construction in which the aforementioned disadvantages can be obviated.

Another object of our invention is to provide a brakeshoe construction in which the shear stress between the braking surface of the brakeshoe and the surface to which the piston applies pressure is distributed to prevent damage to the latter.

These objects and others, which will become apparent hereinafter, are attained in accordance with the present invention in a brakeshoe construction for a disk-type brake which provides a peripheral metal rim extending around the periphery of the brake lining and of a width equal only to a fraction of the thickness of the lining layer and integral (i.e., formed unitarily and in one piece) with a pair of eyes by which the brakeshoe is guided in its motion perpendicularly to these braking faces of the disk. Advantageously, the rim is drawn. unitarily and integrally from a backing plate of the same metal and identical thickness so that the brake-lining support has a box-like configuration and forms a cavity over substantially the entire area of the lining into which the latter is fitted. Along the rim, however, a marginal strip of the brake lining, whose lateral extent is equal substantially to the thickness of the metal forming the rim, can overhang the latter. The total thickness of the lining is thus equal to the depth of the box-like casing formed by the backing plate plus the thickness of this marginal portion. The eyes, in this embodiment, are apertures punched, drilled or stamped from the planar web forming the base of the box-like casing and from which the rim extends in the form of a preferably continuous peripheral flange. In the region of the eyes, however, the rim. may be flattened and broken to accommodate the eyes. Where the rim is overhung by the brake lining, the lining is in effect embedded in the box-like support. Advantageously, the rim extends transversely to the Web by a distance of at least several thicknesses of the sheet metal composing the carrier and a substantial fraction of the thickness of the lining, e.g., between one-eight and one-half the latter thickness.

According to still another feature of this invention, at least two opposite portions of the rim, extending parallel to one another, may be bent inwardly along edges which project to the body of the lining and thus overhang the web connecting .these rim portions. This construction has the advantage that the flanges are U-profiles and penetrate the lining material to prevent axial dislodgment of the lining. In this case, only the two opposite lateral flanges of the rim need be provided, the upper end lower flanges being omitted. The flanges here lie generally parallel to radii of the brake disk and have the double-U profile in a sectional plane lying along a secant of the disk.

As indicated, the brake lining may be mechanically held in the channel formed by the web, which forms the abutment surface for the piston and is substantially coextensive with the braking face of the shoe, and the rim flange or flanges; in addition, however, a cement or bonding layer, preferably of a thickness less than 1 mm., is disposed coextensively with the web and the rear face of the lining. The adhesive layer is an elastomeric material to form a cushion between the lining and the carrier. When the adhesive is used or omitted, a highly satisfactory shear-resistant interface between lining and carrier may be provided when the lining-contacting surface of the web is a lattice work or openwork construction, preferably formed as an expanded metal which in part projects into the corresponding face of the lining. The rim here may be constituted as a frame supporting the lattice work and integral with the eyes mentioned earlier.

According to still another feature of this invention, the web, which is generally planar, may be provided with openings receiving the brakeshoe and having relatively large areas by comparison with the web areas between these openings. When several large openings are provided, the web advantageously has the configuration of a" U whose bight portion is embedded in a central region of the lining and whose shanks terminate the underlining in the guide eyes mentioned earlier. The brake lining is received between the shanks and alongside the latter. Furthermore, this arrangement may be provided with a rim along an inner periphery rather than the outer periphery of the web or along both peripheries thereof. In the case of the U-shaped backing plate, therefore, the bight and shank portions of the U may be internally and externally provided with flanges or rims extending perpendicularly to the plane of the backing plate. Still another open structure provides a frame surrounding the brake lining, which advantageously here is a self-supporting material of significant rigidity, e.g., a sintered metal or, preferably, a ceramic or ceramic-like material such as a cermet. The frame here may be constituted unitarily from a spring wire which is deflected outwardly against its inherent inward resilience to receive the lining body. The eyes are here formed as loops of the frame, preferably as corners thereof. The wire may have a circular cross-section. When, however, a steel band forms the frame material, the loops may be similarly constituted although a rigid brake lining filling the frame, when composed of a ceramic or a ceramic-like material, may be provided with openings forming the eyes and surrounded by the metal frame. In this case, the brake-contacting portion of the lining is constituted as a step of smaller surface areas than the rearward step whose thickness corresponds to the width of the metal band and frame and is formed with holes constituting the eyes. In still anotheropen-work construction, the web has a multiplicity of openings uniformly distributed over the area of the web with which the eyes, along a portion of the web projecting beyond the lining, are unitarily formed. The openings may be bounded by rims or flanges extending into the brake lining. Advantageously, the web is here of an area slightly smaller than the back face of the lining so that its lateral edges, which run radially With respect to the axis of rotation of the disk, are set inwardly from the corresponding edges of the brake lining. Similar openings, of round or square construction, can be provided in the U-shaped backing plate mentioned earlier. A particularly advantageous configuration of the backing plate is a beak outline with openings therealong which are offset from one another, i.e., lie along different radii with respect to the disk. The openings also may be framed by rings projecting into the lining bodies while the eyes are formed of the web portion extending beyond the lining. A similar rim may also be provided around the outer periphery of the web.

As indicated earlier, the invention is particularly designed for use with rigid brake-lining materials such as ceramic or ceramic-like substances, the lining carrier being composed of sheet steel, steel Wire or steel mesh with a thickness of 1.5 to 2 mm. Such carriers have the advantage that they wear, in sliding engagement with guide pins, thereby avoiding destruction of a permanent part of the brake structure. The eyes may, in order to preclude tearing, be bounded along their upper side by the inner surface of an inwardly turned rim flange. Typical ceramic materials for the present purposes are silicates, aluminasilicate, alumina-magnesia-silica composites and cermetS of the type indicated earlier.

The above and other objects, features and advantages of the present invention will become more readily apparent from the following description, reference being made to the accompanying drawing in which:

FIG. 1 is a perspective view, partly broken away, of a disk brake showing the relationship of the 'brakeshoes t0 the guide pins;

FIG. 2A is a perspective view of a brake carrier according to one embodiment of this invention;

FIG. 2B is a cross-sectional view through the carrier of FIG. 2A after the brake lining has been mounted in place;

FIG. 3 is a diagrammatic cross-sectional view illustrating the means for bonding the brake lining to the carrier;

FIG. 4A is a perspective view of a brake-lining carrier according to this invention with inwardly turned rim edges;

FIG. 4B is a cross-sectional view through a brakeshoe having the carrier of FIG. 4A;

FIG. 5A is an elevational view of a modified carrier, partly broken away;

FIG. 5B is a cross-sectional view taken along the line VBVB of FIG. 5A;

FIG. 5C is a detail view drawn to an enlarged scale of the eye construction of this embodiment;

FIG. 6A is a fragmentary elevational view of a brakeshoe provided with a spring-wire frame;

FIG. 6B is a detail cross-sectional view along the line VIBVIB of FIG. 6A;

FIG. 6C is a view similar to FIG. 6A showing another embodiment;

FIG. 6D is a perspective view diagrammatically illustrating a brakeshoe in which the eye is formed in the larger step of a step brake lining;

FIG. 7A is a perspective view of an open-work web carrier according to this invention;

FIG. 7B is a cross-sectional view through a brakeshoe using this latter carrier;

FIG. 7C is a cross-sectional view through a portion of the frame and open-work web, drawn to an enlarged scale and showing a modification of this aspect of the inven 11;

FIG. 7D is a cross-sectional view similar to FIG. 70 but illustrating another modification;

FIG. 8A is an elevational view of the back side of a brakeshoe according to yet another aspect of this invent1on;

FIG. 8B is a cross-sectional view taken along the line VIIIBVIIIB of FIG. 8A;

FIG. 8C is a cross-sectional view taken along the line VIIIC-VIIIC of FIG. 8A;

FIG. 8D is a view similar to FIG. 8A illustrating a modification of the carrier;

FIG. 8B is a cross-sectional view taken along the line VIlIE-VIIIE of FIG. 8D;

FIG. 9A is an elevational view of a back-shaped backing plate according to this invention;

FIG. 9B is a cross-sectionalview through a brakeshoe using this latter plate;

FIG. 9C is an elevational view ofa brakeshoe whose carrier is provided with a multiplicity of regularly distributed openings;

FIG. 9D is a partial cross-sectional view of FIG. 9C.

In FIG. 1, we show diagrammatically a disk brake whose disk 100 may be coupled with a wheel or wheel shaft ofan automotive vehicle and which cooperates with a brake yoke or housing 101 to halt the vehicle. This housing, which is made upof a pair of yoke halves 102 and 103, which are interconnectedby volts 104, is secured to an axial housing (not shown) which is stationary with respect to the axis of rotation of the disk 100. Each of the yoke halves is formed with a respective cylinder 105, 106 into which brake fluid is fed, e.g. via the feeding 107. When necessary, the brake cylinders may be bled of air via the valve 108.. In each of the wheel-brake cylinders, e.g. as shown for cylinder 105, a piston 109 is axially shiftable perpendicularly to' the respective annular braking face 110 of the disk 100 to urge a brakeshoe 111 against this disk. The brakeshoe 111 is here shown to have a carrier 112 of'sheet metal and a ceramic or ceramic-like lining 113 mounted'in this carrier. The latter has a web 114 in the form of a frame spanned by a-wire lattice work 115 ensuring good adhesion to the lining 113. From the frame 114, a rim-like flange 116 extends in the direction of the disk 100'and is partly overlain by a marginal edge of the lining 113 (see FIG; 2B). The frame 114 is also integrally and unitarily formed with a pair of eyes 117 and118 which are axially shiftable along guide rods 119 and 120, the former having been withdrawn to reveal the interior of the brake structure. These rods, which extend perpendicularly to the disk 100.and parallel to its axis of rotation, bridge the yoke halves and ensure proper orientation of the brakeshoes duringapplication of the brake. A clip 121 may be provided to urge the brakeshoes apart. When brake fluid is fedto the cylinders, the pistons apply the bralteshoes to the cylinders and terminate rotation of the latter.

According to a specific feature of this invention, the brakeshoes may be composed of a box-like lining carrier as illustrated at in FIG. 2A. The carrier 10 has a web 10a which is substantially coextensive with the braking face 11a of the brake lining 11, here shown to be a ceramic material retained within the carrier 10. The latter is also of rectangular configuration and has a continuous rim flange 10b extending along three sides of the rectangle and perpendicular to the web 10a. At least the lateral flange portions 100 and 10d, which extend along radii of the disk (see FIG. 1) embed the brake lining ll between them. In this embodiment, however, one side of the rim is flattened to form lugs 12 which project beyond the outlines of the lining 11 and have holes 12a through which guide rods may pass as described in connection with FIG. 1. While the guide rods of the latter figure are shown to be of circular cross-section, other cross-sections are common in the art so that the bores 12a should be of rectangular, elliptical or circular section as is necessary to accommodate the rods. The bottom continuous flange We is here juxtaposed with a short flange 10f bent inwardly hetweenthe lugs 12 to impress the lining from top and bottom as well. As indicated in FIG. 2B, the outlines of the braking face 11a are substantially flush with the outer periphery of the carrier 10 so that marginal portions 11b of the liningoverhang the flange 10b. The carrier 10 may be composed of sheet metal with a thickness of 1.5 to 2 mm. so that it will wear faster than the guide rods. If the flange 10] is eliminated, it is possible to remove the lining 11 radially although we prefer to retain the lining in place by binding this flange 10f inwardly. To increase the strength with which the brakeshoe 10 resists stress in its plane, as discussed earlier, it has been found to be advantageous to provide a layer 13, whose thickness is preferably less than 1 mm. but a minimum of 0.1 mm. of an elastomeric adhesive, e.g. a polybutadiene, neoprene or urethane elastomer. The adhesive layer bonds the ceramic layer 11 to the carrier 10. While the cement layer has been described in general terms here, it will be understood that it may be used to bond the ceramic or ceramic-like lining to the carriers of any of the subsequently described embodiments as well as the embodiments of FIGS. 2 and 2B. The resilience of the layer has been found to be most important in eliminating stresses which crack the lining and totally disrupt the bond between the lining and carrier, especially when the resilient characteristics are joined with the inwardly turned rims or flanges previously described and outlined in greater detail below.

Turning now to FIGS. 4A and 4B, it can be seen that the carrier 20 may have a web 20a which spans a pair of inwardly turned flanges 20c and 20a. lying along radii of the disk. Here the lugs 22 are stamped from the sheet metal and no flange is provided between them. The lugs 22, which extend outwardly beyond the outline of the brake lining 21 (FIG. 4B) have openings 22a by means of which the brakeshoe can be slidablly mounted upon the guide rods. To further increase the incurring effect of the flanges 20c and 20d, the free edges of the latter 20c and 20d are turned inwardly at an obtuse angle so that each of the flanges forms a generally I-shaped or U-shaped profile at a respective edge of the brakeshoe. Here, too, the marginal portions 21b of the brake lining 21 overhang the flanges 20c and 20a. The bond of the brake lining to the carrier can be increased by use of an elastomeric adhesive as indicated in connection with FIG. 3.

Still another modification of this aspect of the invention is to be found in FIGS. 5A through 5C which show a carrier 30 whose rim 30b extends continuously about the whole periphery of the web 30a which has lugs 32 projecting beyond the outlines of the lining (not shown) when the latter is in place. The lugs 32 are formed with openings 32a to receive respective guide rods. As has been described previously, the thickness of the carrier 30, which is composed of sheet metal, is 1.5 to 2 mm. to permit preferential wear of the brakeshoe and delay any wear of the guide rods. The tearing of the eyes 32 and 32a is precluded by a flange portion 33 which overlies the opening 32a and has its inner surface 33a precisely aligned with the upper wall 32b of opening 32. Here the rim follows the outlines of the lug 32 as well as the periphery of the web 30a. The wear resistance at the holes 32a is thus improved without preferential deterioration of the guide rods.

The embodiment represented in FIGS. 6A and 6B omits the web but provides a frame 40 which may be spanned with an open-work structure as illustrated and described in connection with FIGS. 7A through 7D, the frame surrounding the brake lining 41 along its entire periphery and functioning as an equivalent to the rim flanges of FIGS. 1, 2A, 2B, 4A, 4B and 5B through 5C. In this embodiment, however, the circular-section wire 40b forming the frame extends endlessly around the lining body 41 of sintered ceramic material and is composed of steel spring Wire which bears inwardly as represented by the arrows 40h upon the periphery of the lining 41. The latter has a peripheral groove 41b partly receiving the wire 40b. The braking face of the shoe is represented at 41a and is'spaced ahead of the wire frame 40 by the major part of the thickness of the lining. In this case, the brakeshoe is shown to be trapezoidal and to have ear-shaped lugs 42 deformed unitarily from the wire. The shape of these lugs is such that the wire 40 hugs the guide rods (see FIG. 1) over at least of its circumference. Approximately 270 of enclosure is provided in the piston of FIG. 6C. FIG. 6C thus provides a modified lug 42' in the frame 40' which bears inwardly as represented by the arrows 40h upon the rigid lining body 41.

In FIG. 6D, the frame 50 is composed of an endless steel band which peripherally surrounds the large step 51d of the rigid ceramic lining 51 whose braking surface 5111 has a smaller area and thus is provided on the smaller step 51e of this stepped brake lining. The steps 51d and 51e are so arranged that merely a flange 51) of the brake lining is formed, this flange projecting beyond the step 51e toward the guide rods and being formed with the guide opening 52a. The frame 50 extends closely around the periphery of the flange 51 to reinforce the wires of this opening. In this system, use can be made of other brake lining materials, especially the asbestos-fiber reinforced laminate commercially developed as brake-lining materials. The step 51c is formed by milling away the lining body. In all cases, however, the frame 50 should have a width W equal to the thickness T of the larger step.

In FIGS. 7A through 7D we show a variation in the web structure in which a frame 60, integrally and unitarily provided with lugs 62, whose Openings 62a slidably receive the guide rods (see FIG. 1), is provided with a lattice work 64 of expanded metal or wire screen. Thus the brake-lining mass 61 and its rearward surface 610 remote from the braking face 61d engage the screen by partly penetrating into the interstices thereof. As indicated in FIG. 7D, a layer of elastomeric adhesive 63" may be provided at the rear face 610 of the brake lining material 61 to increase the bond. The frame may have peripheral rim flanges as represented at 601) in FIG. 70 which are received in the brake-lining material 61 in the manner described in connection with FIGS. 2A and 2B or A through 5C. In the modification of FIG. 7C, the open-work lattice 64 is expanded metal while a conventional wire screen is provided at 64" in the system of FIG. 7D. The screen is welded to the angle-profile frame 60 of FIG. 7 or a frame composed of circular-crosssection wire as shown at 60 (FIGS. 7C and 7D, respectively).

Still another principle of this invention is illustrated in connection with FIGS. 8A through 8E. Thus, in FIG. 8A, we show a lining carrier 70 of U-shaped configuration which includes a bight portion 75 and a pair of shanks 76 extending in the plane of the carrier and in spaced relationship from one another to form the opening into which the lining body extends. At the free upper end of each shank, lugs 72 are provided with respective apertures 72a adapted to receive the guide rods (see FIG. 1). In this embodiment, the shanks 76 are spaced inwardly of the radial outer side of the lining 71 which penetrates into the opening 77 between the shanks and flanks the latter. The lugs 72 have laterally extending portions 72b which terminate flush with these lateral sides of the lining body. From FIG. 8C, it is apparent that the shanks, here represented at 76', can be provided with rim-like flanges 70b and 700 along the inner and outer peripheries thereof, these flanges being embedded within the lining body 71. It is also possible to make use of principles described in connection with FIGS. 4A and 4B in the instant embodiment; in this case, the free edges of the flanges 70b and 700' will be turned inwardly as shown in FIGS. 4A and 43 to increase the grip upon the ceramic-lining body. A variation of this system is illustrated in FIGS. 8D and 8E wherein the shanks 76", whose free ends have lugs 72" provided with openings 72a" for the guide rods, are provided with openings 77" framed by continuous flanges 77a" which project into the ceramic-lining material 71 in the manner of the peripheral flanges of FIG. 8C. Peripheral flanges may be provided in addition as shown at 7012" in FIG. 8E. In this embodiment, the openings 77" in each shank are aligned along radii of the disk (see FIG. 1). The flanges 77a" and 70b may be stamped from the sheet metal of the carrier as previously described. Similarly, the opening 72a" may be flanked by inwardly extending flanges 72c" Whose function in reinforcing all of the openings is similar to that of the flange overlying the opening in FIGS. 5A through 5C.

Still another modification of the present invention has been illustrated in FIGS. 9A and 9B in which the web 80a of the carrier 80 is of beak (i.e. semicrescent) shape and curves downwardly and inwardly from the upper border 80d which is provided with a pair of spaced-apart lugs 82 whose openings 82a receive the guide rods as previously described. The web lies inwardly from the lateral edge of the pad and extends only over part of the area thereof. At least two openings 87 are stamped in the deep portion of the web and have transversely extending flanges 87a surrounding continuously the respective openings and projecting into the ceramic-lining body 81. Here, too, a peripheral rim may be provided in the manner previously described. It has been found that the pointed beak portion of the carrier 80 maintains a more intimate contact with the lining than rectangular plates coextensively therewith.

In the modification of FIGS. 9C and 9D, the web 80a of the carrier 80 is narrower than the ceramic lining 81'. The openings 87' are here distributed uniformly over the web 80a with uniform spacing and are aligned along radii of the disk. Each opening 87' is bordered by a transverse flange 87a and projects into the ceramic body 81'. The lugs 82', integrally formed on the carrier 80', have openings 82a adapted to receive the guide rods and framed by the flanges 820. The openings 87 are rectangular and are distributed in a rectangular array.

The invention described and illustrated is believed to admit of many modifications within the ability of persons skilled in the art.

We claim:

1. A brakeshoe for the disk brake having a disk rotatable about its axis and engageable by said brakeshoe, said brakeshoe comprising a generally planar body of brake-lining material having a braking face juxtaposed with the disk and a rearward face remote therefrom, said body being formed with a pair of generally parallel lateral edges and a bottom edge interconnecting said lateral edges and transverse thereto; and a sheet-metal lining carrier en gaging said body at least in the region of said rearward face and having an openwork structure partly receiving said material for retaining said body on said carrier,said carrier being formed unitarily with a pair of lugs defining holes of slidably receiving brakeshoe-guide rods of said disk brake, and an elongated sheet-metal web lying inwardly of said lateral edges and received in said rearward face with an outer surface of said web substantially coplanar with said rearward face, said web extending downwardly from said lugs and having bounding edges turned inwardly away from said lateral edges while lying along only a portion of the outlines of said body.

2. The brakeshoe defined in claim 1 wherein said carrier includes flanges overlying said holes for reinforcing same.

3. The brakeshoe defined in claim 1 wherein said body is composed of a ceramic.

4. The brakeshoe defined in claim 1 further comprising a layer of elastomeric adhesive at least partly bonding said body to said carrier.

5. The brakeshoe defined in claim 1 wherein said carrier is formed with a transverse flange extending along an edge of said web and projecting into said body.

6. The brakeshoe defined in claim 5 wherein a pair of transverse flanges is provided at least along two opposite edges of said web to form a pocket for a portion of said body between them.

7. The brakeshoe defined in claim 1 wherein said sheetmetal web is provided with at least one opening and a transverse flange projecting into said body and integral with said web while surrounding said opening.

8. The brakeshoe defined in claim 7 wherein said web is provided with a multiplicity of openings each surrounded by a respective flange penetrating into said body.

10 9. The 'brakeshoe defined in claim 7 wherein said Web 3,162,271 12/1964 Hanson 18873 is of U-shaped configuratibn with a pair of spaced-apart 3,349,871 10/1967 Walther et a]. 18873 shanks defining said opening between them.

10. The bra-keshoe defined in claim 7 wherein said web FOREIGN PATENTS is generally beak-shaped and is formed with a plurality of 5 1,026,225 4/ 1966 Great Britain. apertures constituting said opening. 254,404 7/ 1927 Italy.

References Cited A GEORGE E. A. HALVOSA, Primary Examiner UNITED STATES PATENTS U S Cl XR 1,880,750 10/1932 Brackett. 10 2,916,123 12/1959 Garmayer 1 188-251 X 1 3,072,221 1/1963 Peras 188--73 

